Hi!
I have a problem with the opening of the files saved from mail attachments. Access to the mailbox via IMAP. After downloading the file to my hard drive, it is becoming less original 10-30Kb. The downloaded file is not open, because he damaged. Using another mail client (such as Microsoft Outlook Express 6), there are no such problems.
Have used program Portable Thunderbird 2.0.0.6 (English version) without additional settings, and plug-ins (as is). A program install on a portable USB hard drive.
I remember I (and many other people too) had the same problems with Thunderbird 1.x when I used it a lot - but that was not the portable version so this might as well be a general problem for Thunderbird.
Anyway, I can't give any feedback on the situation with the latest version cause I have stopped using Thunderbird with IMAP ever since.
I IMAP interesting that the mail (several gigabytes) is inboxes. There is no need to have a modern USB-drive, mail is not lost in case of theft or USB-drive. It is a pity that the problem has not yet been resolved.
I just happened to have the same problem again with Portable Thunderbird 2.0.0.6:
I tried downloading an attachment of around 4MB and the download finished at about 2MB - deleting the file and doing "save as..." again didn't help neither.
However, I'm still quite sure that this is a general problem of Thunderbird and not a matter of the portable version...
I've had this problem with local Thunderbird on occasion. Sometimes a restart fixes the issue. Other times, I've had to delete all my local files for that mailbox and have Thunderbird get them fresh from the IMAP server.
Sometimes, the impossible can become possible, if you're awesome!